Phillip Gomm from the RAC foundation says there's been a significant rise in the cost of running a car in the last decade.
He speaks after a report by the RAC showed that people in Wales rely on their car, more than anywhere else in the UK. The Welsh Government acknowledges that public transport is crucial.
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Medication designed for animals was taken from the building in Abertillery on Thursday night.
More than a thousand riders will be taking part in a series of events in and around the town.
Some warm spells of sunshine will develop, although scattered heavy and thundery showers are also expected during the afternoon.